Synthetic nitrogen fertilizers such as urea help feed about half of the world’s population. But making urea is a multistep endeavor that consumes copious amounts of energy and emits large amounts of ...

This e-learning module gives an overview of the carbon-13 urea breath test (13 C-UBT) for Helicobacter pylori (H. pylori) infection. It describes a robust test for the diagnosis of gastric H. pylori ...

Insecticidal activity of urea, ammonium nitrate and solutions of both compounds in different ratios (widely used as fluid fertilizers) was tested in model trials under laboratory conditions against ...

Diesel vehicles have significant advantages over their gasoline counterparts including a more efficient engine, higher fuel economy, and lower emissions of HC, CO, and CO₂. However, NOx control is ...

Ammonia can be produced by the break-down of amino acids, or by the gut bacteria in humans. If the level of ammonia in the blood becomes too high, then it becomes toxic to the brain. The urea cycle ...